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11 Filling system
Information of the actual water pressure:
The controller Home screen shows OK. The actual water pressure is
always visible.
Water pressure is too low (<0.8 bar):
Power is reduced by 20%. The installation should be relled.
Water pressure is too low (<0.5 bar):
The boiler is taken out of operation. The installation should be relled.
Air purge program:
After the installation has been relled and if the pressure was below 0.5 bar
the air purge program will start. This will last for approximately 7 minutes.
Water pressure is too high (> 3.0 bar):
The boiler is taken out of operation.
The installation pressure should be reduced by draining water from the
heating system.
The central heating installation needs to be lled with potable water according to the requirements in chapter
9.3 'Water quality'. For lling or topping up the installation use the lling loop according to the following
procedure (see gure 11.
1 Attach the lling loop pipe to the lling loop assembly (between position 1 and 2);
2 Open the small lling loop valves A and B;
3 Slowly ll the central heating system up to 1.0 – 1.2 bar;
(at the bottom left a pressure gauge indicates the water pressure in the central heating system)
4 Close the lling loop valves A and B;
5 Vent the entire heating installation starting at the lowest point;
6 Check the water pressure and top up if necessary to 1.0 – 1.2 bar;
7 Check the lling loop valve is closed;
OPEN CLOSED
1
2
A
B
3
Figure 11.a
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